package oo_day03;
/** 多态的测试类 */
public class PolymorphicDemo {
    public static void main(String[] args) {
        //演示向上造型（多态）的第1点应用:
        /*Master master = new Master();
        Dog dog = new Dog("小黑",3,"黑");
        Chick chick = new Chick("小花",3,"花");
        Fish fish = new Fish("小金",1,"金");

        master.feed(dog); //在传参的同时，系统自动做向上造型   Animal animal = dog;
        master.feed(chick);
        master.feed(fish);*/
        //演示向上造型（多态）的第2点应用:
        /*
        //Animal o = new Animal();  //编译错误，抽象类不能被实例化
        Animal[] animals = new Animal[5];
        animals[0] = new Dog("小黑",2,"黑");  //向上造型
        animals[1] = new Dog("小白",1,"白");
        animals[2] = new Fish("小金",1,"金");
        animals[3] = new Fish("小花",2,"花");
        animals[4] = new Chick("小灰",3,"灰");
        for (int i=0;i< animals.length;i++){  //遍历所有动物
            System.out.println(animals[i].name); //输出每个动物的名字
            animals[i].drink();  //每个动物喝水
            animals[i].eat();  //每个动物吃饭

            //狗看家/游泳、鱼游泳、鸡下蛋
            if (animals[i] instanceof Dog){
                Dog dog = (Dog) animals[i];
                dog.lookHome();
            }
            if (animals[i] instanceof Chick){
                Chick chick = (Chick) animals[i];
                chick.layEggs();
            }
            if (animals[i] instanceof Swim){  //适用于所有实现Swim接口的(会游泳的）
                Swim s = (Swim) animals[i];
                s.swim();
            }
        }
        */
        //演示强转成的条件:
        /*Animal o = new Dog("小黑",2,"黑");
        Dog g =(Dog) o;  //引用o所指向的对象，就是Dog类型
        Swim s = (Swim) o;  //引用o所指向的对象，实现了Swim接口
        //Fish f = (Fish) o;  //运行时会发生ClassCastException类型转换异常

        System.out.println(o instanceof Dog);   //true
        System.out.println(o instanceof Swim);   //true
        System.out.println(o instanceof Fish);   //false
        if (o instanceof Fish){  //false
            Fish f =(Fish) o;
        }else{
            System.out.println("o不是Fish类型");
        }*/
        //演示向上造型:
        Dog o1 = new Dog("小黑",2,"黑");   //狗是狗
        //o1.name/age/color/drink()/eat()/swim()/lookHome();
        Animal o2 = new Dog("小黑",2,"黑");   //狗是动物----向上造型
        //o2.name/age/color/drink()/eat()
        Swim o3 =new Dog("小黑",2,"黑");   //狗会游泳----向上造型
        //o3.swim();


    }
}
